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Yet another form of HEPA is mini pleat HEPA: In exactly the same box, the utmost surface area is provided with the pleat; that's why, CFM is larger, and stress fall is likewise a lot less in the case of mini pleat (15 mmwg compared to HEPA [25 mmwg]). Mini pleat HEPA may possibly give about 25 to 40% additional accuracy when put next to standard HE